Loop construction



July 24, 1934. J. A. PROCTOR LOOP CONSTRUCTION Filed June 25, 1931 wwf wr N INVENTOR JOHN ALBERT P OCTOR BY #6 ATTORNEY Patented July 24,1934 in I A 1 9 7 591;

Ito Radio Corporation of America, acorporation I f DFlaware J I A ic t o 2 931; S rial 546,727, 6' Cla ms. (01. zoo- 33) 'This' invention relates to'dir'ectional receiving Cases in an absorption member, the p v Systems, and in particular to anew and'improved to W h high as dompaled W h the 6 shield for the signal absorption member, and to troma'gnetic orinductive efiect; This predomi- I mg -n va m th d froducing 'the shieldfi'and nation of capacity inthe absorption member replacing the absorption conductor therein. I suits from the close spacing between the turns, 9.9. More in detail; this'invention relates todirecwhich in shielded-loopsknown heretofore were tionalaerials comprising omosmom: turns or hOt retained-in spacedfrelationship with respect conductors which are enclosed-ma r'net'allic shield Itoeachv other. '11. :I r .7 to protect them frorrfithe elements, et c andf y, andliiiitsbmadst p h Object morefiri'particiilar to the th dof pr du in of applicants'invention"is toproducea directional 95. the metallic shield; and to winding the conductors rp i n memb'erand a shield for'the same in in the-shield in pr er spaged iolati which-none or the defects enumerated'above are pirectional "absorption members, as described P n abovqn emus heret f re ini-h'aftfl "Di Another object of applicants-invention isfto fecfionaliaborptjon members ndq gd' fil i tgi produce a directional aerial shield which is-con- 1. 9 shielding to rotect them" frogmfthecleinents ha striicted of a singlepie'ce'of metal and in which be n knownheretofom n t t,- m m of no joint is necessary-and in which the metallic known directionalabsorp ion members gnclusgd shield is entirely closed except for the openings in shielding a hown p g' oz 1-, 10 of through whichthe conductors are placed in the a Wireless Direction Finding published by R. Keen ihilm i 1111927. KolstenUnitedstates Patent No.-1};6,73',-, An added Object f app ca ts nvention is t "249, also shows a. directional absorption member p v d a t n l a i in ud sh ldin which at t, might appear o e t mu to means therefor; as described above, in which proapplicants absorption member and shield. as e ade w r b o ption briefly described abov x v I member-may be inade eta-single continuous con- 39 1 In these heretofore known, arrangements the *ducforg-whifih'can be readily Placed in th loop- 7 Shield constructed comiiris ed several iece 'Ayfurtherjfobject of applicantrs invention is "andlas'asse bled had several'openings' -f joints to;'provide- 'a-hovel shielding means-including therein which'plfllittdth elements to'erite'r and "m pp f b p i n OndllfitOr .deterioratethe conductors enclosedin: the shield. h hi and-for Properly p the Several 111 1 0 3113 r g t 's 5 -@u tih the 700m turnsof the conductorwith respect to each'other f ducto'rs. fEspecially aretheabove defects presa'ndwim e t h' w i ent in ca e th hi 1 d g t 'bgi e m Thepr'es'ent invention; in addition to the obboard where the action-of saltwater is snch as J'ects brifiY"ut1ined a e includes to weaken the structurebOth electrically and methdd'o'flasflyiahd.economicallr pr'biiucingthe mechanically after some service. shield for-the loo in quantitiesand for wind "V -v Anotherdefect-in tructures known hef ing the absorption membe'rwhich comprises a in-the art is due some not that the shield can i Cbniinuous*conduciriinthe Shield; s not 'eeconomically produced since it is-inade up Briefly a b e l v e e 0i several pieces which,afterbeins constructed, 'ztaineqilin ac an e withi'applicanis invention 5 had-to be asse'mmd orbolted together. by P l je im i i d" and 1Moreover,'injtheiloopshields kn'own'heretowm. .'m dv"?l tubular memper :fore invthe art, no provision is made whereby the fi ii br hg gv $5 g ig g z mme ay e a eniga a,

op ace Smge um the conductor may'befireadilywound or-placed conductors n the shieldingstructureand solder .therein The metallsiuflmmdmgl these open the end of, each conductor to the start of another s oo e y' m n ma t conductor, in that manner produc & 60111111111- 'known manner and metal plates are bolted there- 1 8 W i I 4111- to' so thattheconductor'is"coinpletelyenclose'd #19 Furthermore; mi arrangemen s k ow 'h retoand'the" shield is weatherproof. f In'order 'that' 'foreinthe art, noprovision ismadefor spacingthe -theclosed member does not-provide a complete individual turnsfrom each other and-from'the magneticcircuit it is broken at-ione'point-and 1 enclosir igqmetallic shield; This oftentimes .rethen bolted-together with a piece of'insulating z-..55 sulted; in an-unsymmetrical structure and inaall material between theLadjacent-ends." .The closure i11 of said arms for winding the conductor turns,

waterproof covering means for closing said open-' ings, a vertical insulating sheet having a central aperture interposed between the two upper 'arms at the apex of the loop aerial to prevent said metallic closure member forminga closed electrical path, and a clamping bolt passing through the aperture in said insulating sheet, insulating tubes located each side of said insulating sheet for insulatingly covering said clamping bolt.

2. A directional loop aerial comprising a tubular closure member having a pluralty of arms of continuous metal, openings in each of said arms for winding the conductor turns, waterproof covering means for closing said openings, a vertical insulating sheet interposed between the two upper arms at the apex of the loop aerial to pre vent said metallic closure-member forming a closed electrical path, and a clamping member for clamping said upper arms together and retaining said insulating sheet.

3. A directional loop aerial comprising a tubular closure member having a plurality'of arms of continuous metal, openings in each of said arms for winding the conductor turns, waterproof covering means for closing said openings, a vertical insulating sheet having a central aperture interposed between the two upper arms at the apex of the loop aerial to prevent said metallic closure member forming aclosed electrical path,

a clamping member for clamping said upper arms together and retaining said vertical insulating sheet, and horizontal and vertical. insulating sheets retained within said openings for retaining and spacing the conductor turns.

4. A directional loop aerial comprising a tubular closure -member having a plurality of arms jof continuous metal, openings in each of said arms for winding the conductor turns, waterproof covering means for closing said openings, a vertical insulating sheet interposed between the two insulating washer, clamping nuts located within upper arms at the apex of the loop aerial to prevent said metallic closure member forming a closed electrical path, a clamping member comprising an insulated bolt for clamping said upper Y armstogether and retaining said vertical insulating sheet. I

r 5. A directional loop aerial comprising a tubular closure member having a plurality of arms of continuous metal, openings in each of said arms for winding the conductor turns, waterproof covering means for closing said openings, a vertical insulating sheet having a central aperture interposed between the two upper arms at the apex of the loop aerial to prevent said metallic closure member, forming a closed electrical path, a central boss located'on each side of said apex, a clamping bolt located within said boss, and two insulating tubes. covering said bolt, said insulating tubes located each side of said vertical insulating sheet, a housing within said boss, an

said housing, and a metallic cover closing the ends of said housing. V 6. Means for substantially completev and electrostatically enclosing a loop aerial including one or more turns of conductingmaterial, and forv permitting said loop to be efiected by magnetic fields comprising a continuous metallic shielded 7 member: formed with itsends adjacent each other, the ends of said member being'at the apex of said shield and said loop, a space between said ends to prevent said metallic shielded memberfrom forming a closed electrical path,a vertical insulating member interposed between the ends of said shields, means 'for, clamping said ends together to retain said vertical member and to increase the mechanical strength of said shield, an opening in saidcontinuous "metallic. shielded member .to

permit winding of said loop, and metallic means for closing said last mentioned opening.

JOHN ALBERT PROCTOR. 

